Is there any concern regarding 304SS and Copper being in contact?

No. While it is always best practice to avoid having dissimilar metals in direct contact whenever possible, the Stainless Steel and Copper and Brass metals used in the manufacture of our BOSHART BPF and SSPF Push-Fit fittings get along. The galvanic action is rated as insignificant.

BOSHART BPF and SSPF Push-Fit fittings like all other brands have Stainless Steel Gripper rings in direct contact with damp / wet conditions due to the condensation from cold water pipes. This results in pooling water inside the fitting on the S.S. Gripper Ring side of the O-ring seal, which is in contact with either a Brass, Copper or 304SS Fitting Body as well with the Copper Pipe.

These metal combinations have been time proven for over 30 years since the first push fit fitting design was introduced in the 1990’s. Brass push fit fittings have been used in North America for 20 plus years during this time there has not been any issue with stainless being in direct contact with copper or brass.

The reason why some stainless-steel alloys and copper or copper alloy brasses work together while others do not, is that the alloys which are being joined directly should have no more than a 0.15V to 0.25V differential on the anodic index.

The alloys used in the manufacture of the BOSHART BPF and SSPF Push-Fit fittings are extremely close together as listed on the index with a 0.15V difference, which is well within the acceptable range (0.25V max.). This means they can be safely connected with minimal risk of galvanic corrosion.

WARNING: The above information does not apply to all Stainless Steel, Brass and / or Copper alloys. There are hundreds of alloys in these general categories, many of which are not within the acceptable range of 0.15V to 0.25V differential on the anodic index and joining them directly will result in galvanic corrosion and premature failure. Therefore, it is important to investigate the anodic rating of specific alloys as the above information does not cover other alloys outside of the push fit fitting specifications.